"biru" meaning in Old Irish

{
  "forms": [
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "sga-mutation",
      "source": "mutation",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "biru",
      "source": "mutation",
      "tags": [
        "mutation",
        "mutation-radical"
      ]
    },
    {
      "form": "biru",
      "source": "mutation",
      "tags": [
        "lenition",
        "mutation"
      ]
    },
    {
      "form": "mbiru",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form",
        "mutation"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "verb form",
        "3": "",
        "head": "",
        "var": ""
      },
      "expansion": "biru",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "biru",
      "name": "sga-verb form"
    }
  ],
  "inflection_templates": [
    {
      "args": {},
      "name": "sga-mutation"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Old Irish entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 13 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "_dis": "2 1 1 2 2 1 9 18 2 1 4 6 4 1 3 1 2 1 18 18 6 2 1",
          "kind": "other",
          "name": "West Coast Bajau entries with incorrect language header",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "form_of": [
        {
          "word": "beirid"
        }
      ],
      "glosses": [
        "first-person singular present indicative absolute of beirid"
      ],
      "id": "en-biru-sga-verb-NSidPd7A",
      "links": [
        [
          "absolute",
          "absolute"
        ],
        [
          "beirid",
          "beirid#Old_Irish"
        ]
      ],
      "tags": [
        "absolute",
        "first-person",
        "form-of",
        "indicative",
        "present",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈbʲi.ɾu/"
    }
  ],
  "word": "biru"
}

{
  "categories": [
    "Pages with 13 entries",
    "Pages with entries",
    "West Coast Bajau adjectives",
    "West Coast Bajau entries with incorrect language header",
    "West Coast Bajau lemmas",
    "West Coast Bajau nouns",
    "West Coast Bajau terms derived from Proto-Malayo-Polynesian",
    "West Coast Bajau terms inherited from Proto-Malayo-Polynesian",
    "bdr:Blues",
    "bdr:Colors"
  ],
  "forms": [
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "sga-mutation",
      "source": "mutation",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "biru",
      "source": "mutation",
      "tags": [
        "mutation",
        "mutation-radical"
      ]
    },
    {
      "form": "biru",
      "source": "mutation",
      "tags": [
        "lenition",
        "mutation"
      ]
    },
    {
      "form": "mbiru",
      "source": "mutation",
      "tags": [
        "error-unrecognized-form",
        "mutation"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "sga",
        "2": "verb form",
        "3": "",
        "head": "",
        "var": ""
      },
      "expansion": "biru",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "biru",
      "name": "sga-verb form"
    }
  ],
  "inflection_templates": [
    {
      "args": {},
      "name": "sga-mutation"
    }
  ],
  "lang": "Old Irish",
  "lang_code": "sga",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "Old Irish entries with incorrect language header",
        "Old Irish non-lemma forms",
        "Old Irish terms with IPA pronunciation",
        "Old Irish verb forms",
        "Pages with 13 entries",
        "Pages with entries"
      ],
      "form_of": [
        {
          "word": "beirid"
        }
      ],
      "glosses": [
        "first-person singular present indicative absolute of beirid"
      ],
      "links": [
        [
          "absolute",
          "absolute"
        ],
        [
          "beirid",
          "beirid#Old_Irish"
        ]
      ],
      "tags": [
        "absolute",
        "first-person",
        "form-of",
        "indicative",
        "present",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈbʲi.ɾu/"
    }
  ],
  "word": "biru"
}

{
  "called_from": "inflection/735",
  "msg": "inflection table: unrecognized header: 'nasalization'",
  "path": [
    "biru"
  ],
  "section": "Old Irish",
  "subsection": "verb",
  "title": "biru",
  "trace": ""
}